Lecture_15_102611 - Lecture 15 Chemical Reactions Goals...

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Lecture 15: Chemical Reactions Goals: Write balanced chemical equation from the formula of the reactants and products for a chemical reaction. Identify a chemical reaction as a combination, decomposition, single replacement or double replacement reaction. Define the terms oxidation and reduction. Outline (Timberlake 6.1-6.3): ± Chemical Reactions (6.1) ± Types of Reactions (6.2) ± Oxidation-Reduction Reactions (6.3) Problems for Extra Practice: 6.1, 6.3, 6.5, 6.9, 6.11, 6.13, 6.15, 6.17
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Chemical Change In a chemical change , • reacting substances form new substances with different compositions and properties • a chemical reaction takes place
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Chemical Reactions In a chemical reaction , • a chemical change produces one or more new substances • there is a change in the composition of one or more substances
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Learning Check Identify the visible evidence of a chemical reaction in each of the following: 1) Methane gas in an outdoor heater burns with a blue flame. 2) Bleach removes stains from a shirt. 3) Bubbles of CO 2 are released when baking soda is mixed with vinegar.
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Chemical Equations A chemical equation • gives the chemical formulas of the reactants on the left of the arrow and the products on the right Reactants Products
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Symbols Used in Equations Symbols used in chemical equations show • the states of the reactants • the states of the products • the reaction conditions
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Chemical Equations are Balanced In a balanced chemical reaction , • atoms are not created or destroyed • the number of atoms in the reactants is equal to the number of atoms in the products
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In a balanced chemical equation , • there must be the same number of each type of atom on the reactant side and on the product side • numbers called coefficients are used in front of one or more formulas. Al + S
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This note was uploaded on 01/18/2012 for the course CHEM 120A taught by Professor Leahmiller during the Fall '11 term at University of Washington.

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Lecture_15_102611 - Lecture 15 Chemical Reactions Goals...

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